diff --git a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
index 2d9013229..9e036b652 100644
--- a/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
+++ b/lib/Doctrine/ORM/Mapping/ClassMetadataInfo.php
@@ -1629,7 +1629,6 @@ class ClassMetadataInfo implements ClassMetadata
                     ? $joinColumn['fieldName']
                     : $joinColumn['name'];
             }
-            unset($joinColumn);
 
             if ($uniqueConstraintColumns) {
                 if ( ! $this->table) {
@@ -1755,7 +1754,6 @@ class ClassMetadataInfo implements ClassMetadata
                 $mapping['relationToSourceKeyColumns'][$joinColumn['name']] = $joinColumn['referencedColumnName'];
                 $mapping['joinTableColumns'][] = $joinColumn['name'];
             }
-            unset($joinColumn);
 
             foreach ($mapping['joinTable']['inverseJoinColumns'] as &$inverseJoinColumn) {
                 if (empty($inverseJoinColumn['name'])) {
@@ -1783,7 +1781,6 @@ class ClassMetadataInfo implements ClassMetadata
                 $mapping['relationToTargetKeyColumns'][$inverseJoinColumn['name']] = $inverseJoinColumn['referencedColumnName'];
                 $mapping['joinTableColumns'][] = $inverseJoinColumn['name'];
             }
-            unset($inverseJoinColumn);
         }
 
         $mapping['orphanRemoval'] = isset($mapping['orphanRemoval']) && $mapping['orphanRemoval'];
diff --git a/lib/Doctrine/ORM/Tools/Console/Command/ConvertDoctrine1SchemaCommand.php b/lib/Doctrine/ORM/Tools/Console/Command/ConvertDoctrine1SchemaCommand.php
index 0eb1735dc..71d72deb8 100644
--- a/lib/Doctrine/ORM/Tools/Console/Command/ConvertDoctrine1SchemaCommand.php
+++ b/lib/Doctrine/ORM/Tools/Console/Command/ConvertDoctrine1SchemaCommand.php
@@ -180,7 +180,6 @@ EOT
                 );
             }
         }
-        unset($dirName);
 
         if ( ! file_exists($destPath)) {
             throw new \InvalidArgumentException(